Toyota Corolla 2012 Problems

You shouldn't have let the car out of your sight; instead you should have had it inspected by an independent mechanic for possible damage that might have been caused in the fire. Even now I would get it inspected for damage, anything could have been damaged in the   fire, wiring, hoses, paint, plastic components, you won't know until it's properly checked. You should also consider consulting the consumer affairs people with a view to further claims against the people who did the servicing.

The only way to resolve a problem is to report it, first to the dealer, then to the carmaker if that doesn't solve it. After that it becomes difficult. My view is that there should be an industry ombudsman who can resolve issues between carmakers and their customers.
 

It could be related to the transmission calibration, but it's not possible to say for sure without driving it. Take it back to your dealer and take him for a drive so you can demonstrate the problem. That way he might be able to fix it.